Zydrate is a highly addictive painkiller developed by GeneCo as one aspect of its highly lucrative business plan.
Zydrate is also sold in a debased street form, which is extracted from the bodies of the dead by grave-robbing drug dealers. Street Zydrate is of highly dubious and variable quality (although always lower quality than the real drug). Although oddly, it still looks exactly like the pure kind, no matter how long the person has been dead or what quantity of Zydrate was in their system.